“…In addition, during the 1920s and 1940s over a hundred pharmacological studies were published in different journals of psychology. Specifically, the effects of substances such as caffeine (Schilling;1921;Peterson & Carter, 1936;, tobacco (Meyer, 1923), alcohol (Peterson & Carter, 1936), cocaine (Fowler, 1940), nicotine (Humphrey, 1942), peyote (Fernberger, 1932), atropine (Peterson & Carter, 1936), sodium phenobarbital (Williams & O'Brien, 1937), benzedrine (Searle & Brown, 1938;Wentink, 1938), adrenalin (Wentink, 1938;Fowler, 1941), sodium amytal (Settlege, 1936), metrazol (Karn, Lodowski & Patton, 1941), picrotoxine (Tainter, 1943), ephedrine (Wentink, 1938), insulin (Wentink, 1938;Stellar, 1943), coramine (Turchioe, 1945), pregnenolone (McGinnies, 1947) or opioids (Simon & Eddy, 1935;Eddy & Ahrens, 1935), among others, were widely tested on a varied plethora of aspects in both animals and humans. Particularly important in those earlier years of psychopharmacology were the studies by psychologist Harry L. Hollingworth which are cited as a standard for psychopharmacological research (Benjamin, Rogers & Rosenbaum, 1991;Hollingworth, 1912b;Hollingworth & Poffenberger, 1920).…”